listee



(No Model.) 2 Sheets-Sheet 1. J. T. LISTER.

TELEPHONE ATTACHMENT. No. 350,203. Patented Oct. 5, 1886.

A fforneys N. PETERS, Pholninhngnphar, Washinglm D. C.

JOHN T. LISTER, OF CLEVELAND, OHIO, ASSIGNOR, BY

ASSIGNMENTS, TO SAME PLA GE.

PATENT OFFICE.

DIRECT AND MESN E JAMES C. ONETL AND CHARLES A. DAINZ, BOTH OF TELEPHONE ATTACHMENT.

fiPECIFIOATION forming part of Letters Patent No. 350,203, dated October 5, 1886.

Amlicntion tiled l etembcr l0, i884. Serial No. 149.965. (No model.)

To aZZ whom it may concern.-

Be it known that 1', J onx l. Lrs'rnn, of Cleveland, in the conntyof Guyahoga and State of Ohio, have invented certain new and useful Improvements in Telephone Attachments; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in telephone attachments, and has for its object an apparatus for receiving and conducting sounds from the speaker to a telephone transmitter, to the end that a greater volume of sound is transmitted and the sounds are less audible in the vicinity of the speaker.

A further object is to provide an annular space in the receiver, out of the line of the direct sound-waves, into which the reflected sound-waves may retire and expend their force without breaking the direct sound-waves from the speaker, to the end that the message transmitted is thereby rendered more distinct.

A l'urther object is to provide a deflector inside of the receiver to prevent a direct impact of the sound-waves against the diaphragm of the transmitter, to the end that with loud conversation. a rattling ol' the diaphragm is avoided.

A further object is to provide mechanism, preferably a jointed bracket-arm, for supporting the receiver, to the end that the receiver may easilybe attached to or disconnected from the transmitter.

\Vith these objects in view my invention consists in certain features of construction and in combination of partshereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation in section of the receiver, and side elevation of the deflector in one of its positions in the receiver. Fig. 2 is a side elevation in section of the inner portion of the receiver with the deflector shown in a modified position. Fig. 3 is a view in perspective of the receiver and transmitter with the former supported in position against the latter by a jointed arm 5 also, another device is shown for securing the receiver to the transmitter. Fig. 4 is a view in perspective of a transmitter,

showing mechanism for supporting the receiver from the back or wall board that sup ports the transmitter. Fig. 5 is a view in perspective ot' a washer, preferably elastic, for making a tightjoint between the transi'nitter and receiver; and Fig. 6 is a modification.

The receiver consists of the tubes or casings A and A, circular in cross section and firmly attached to each other, or integral, if preferred, or

at the small end should not exceed the diame- 7o ter of the mouth of the transmitter D, while the. larger end 01' the part A should consider ably exceed the size of the small end of the part A, so that a portion of the chamber l3 comprises an annular space at b, that is outside ot the direct line of the sound-waves in their passage from the speaker to the transmitter. The outer chamber, B, receives the sounds from the speaker-,and the inclosing-walls thereof are of suitable shape and adapted to con.

duct the sound-waves toward the transmitter, by reason of which a larger volume of sound is transmitted, and less sound is wasted in the vicinity of the speaker. \Vith a single tunnel-shaped receiversuch, for instance, as would be had it the part A continued to the transmitter-the words transmitted through the telephone are not always sufficiently dis tinct, owing to the deflected sound-waves from the diaphragm more or less commingling with and breaking the direct sound-waves from the speaker. The enlarged part of the chamber B at b, bounded in front by the shoulder a, furnishes an annular space, into which these deflected sound-waves may retire and expend their force out of the way of the direct soundwaves, and the result is the words transmitted through the telephone are rendered distinct, and low conversation or even whispers are audible at the terminus of the line, although it be miles away. The receiver is preferably made of vulcanized rubber, al-

2 ssazos though wood, paper, and various other mate rials that are light and strong may be used. The receiver is preferably supported by means of a jointed arm, E, that is attached at one end to any suitable sup port-such,for instance, as the wall plate or bracket E, and the free end is connected with the band 6 that encircles the receiver. With this device the receiver is quickly removed from or brought in position with the transmitter. Various other devices may be used, such as an elastic part, F, Fig. 3, that is secured to the receiver and hooks over the edges of the transmitter. device is shown. in Fig. 4, where the elastic part G is connected with the receiver and hooks on the waltboard (Z, to which'the transmitter is attached. Another modification is shown in Fig. 6. The ring His secured to the receiver, and is provided with screw-holes h, by means of which. it may be more permanently secured to the transmitter.

The receiver thus far described is all that is required in ordinary conversation, but when the speaker indulges in loud tone of voice a rattling of the diaphragm is frequently produced that is exceedingly annoying and interferes with. the functions of the diaphragm. To remedy this difficulty I have provided a deflector, I, preferably conical or conoidal in form, and located inside of the receiver with the apex presenting toward thespeaker, as shown, to prevent a direct impact of the sound waves upon the diaphragnnby means of which the aforesaid rattling of the diapragm is prevented. The deflector may be located as shown in Fig. 1, or as shown in Fig. 2, or at intermediate or other points, its exact location longitudinally in the receiver not being essential. The reflector is provided with the springs i, that recoil against the walls of the receiver and hold the deflector in the required position. The diameter of the deflector at the base should be such as to leave a narrow space between it and the part A, and therefore will vary somewhat according to its location in the chamber B.

My improved apparatus is well adapted to be used in connection with the so-calletPBlake or other telephone-transmitter.

I am aware that it is not broadly new to provide a telephone with a funnel-shaped sounda receiver capable of being moved away from the mouth of the transmitter, and hence I make no broad claims thereto.

Vhat I claim is- 1.. As an article of manufacture, a sound- A similar receiver adapted to be attached to or placed in juxtaposition with aso-called Blake or other telephone-transmitter, said sound-receiver consisting, essentially, of successive funnel-shaped chambers, joined together at their ends, each chamber having its apex presenting toward the. telephone-transmitter and its base toward the speaker, substantially as set forth.

2. In combination with a telephone-transmitter, a sound-receiver consisting of successive funnel-shaped chambers joined together at their adjacent ends, said funnel-shaped chambers having their bases presenting toward the speaker and their apices toward the telephone-transmitter, substantially as set forth.

3. In combination with a telephone-trans mitter, a sound-receiver, said sound-receiver consisting of successivechambers substantially funnel-shaped, the chambers next adjacent to the telephone-transmitter provided with the sound-reflecting shoulder a, and having its apex end flush with or inside of the mouth of the telepholie-transmitter, substantially as set forth.

4. In combination with a telephone-transmitter, a sound-receiver consisting of successive chambers substantially funnel -shaped, having their bases presenting toward the speaker with'the larger end of the inner chambers of greater diameter than the contiguous smaller end of the outer chamber, the said chambers being joined together at their ends, substantially as set forth.

5. In combination with a sound-receiver for a telephone-transmitter, consisting of successive chambers substantially funnel-shaped,

with their bases presenting toward the speaker and their apices toward the telephonetransmitter, of a sound-deflector preferably conical or conoidal in form and located inside the said receiver with its apex presenting toward the speaker, substantially as set forth.

6. An attachment for telephone-transmitter,

consisting, essentially, of a jointed arm rigidly secured at one end to any suitable support,

and provided at its free end with. a funnel' shaped sound-receiver, which latter can be moved against or away from said transmitter, substantially as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 1st day of December, 1884.

JOHN T. LISTER.

\Vitnesses:

CHAS. I-I. DORER, ALBERT E. LYNCH. 

